Metal-working machine



0. S. HAMMAGREN.

METAL WORKING MACHINE. APPLICATION FILED MAR. i2. I920.

Patented Oct. 11 1921.

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HAMMA REN. 5w

A T TORNE Y6 0. S. HAMMAGREN.

METAL WORKI-NG MACHINE.

APPLICATION FILED MAR 12, 17920.

Patented Oct.- 11, 1921.

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ATTORNEYS.

O. S. HAMMAGREN.

METAL WORKING MACHINE.

APPLICATION FILED MAR. 12, 1920.

1,392,937. Patented Oct. 11, 1921.

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ORAN HAMMAGREN, OF MINNEAPOLIS, MINNESOTA.

METAL-WORKING MACHINE.

Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed March 12, 1920. Serial No. 365,180.

To all whom it may concern:

' Be it known that I, ORAN S. HAMMAGREN, a citizen of the United States, residing. at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Metal- Working Machines, 'ofwhich the following is a specification.

' view in side elevation.

My invention relates to metal working machines. 7 An object of my invention is to provide a. machine in which a grinding wheel maybe rotated at a high rate ofspeed and at the same time given not only a slow longitudinal reciprocatory motion but also a planetary motion. Another obgect 1s to provide means for changing the extent of the planetary motion whenever desired. Another object is to provide a machme which may be readily changed for use either as a grinding machine or for use in boring, drilling etc.

The fiill objects and advantages of my invention will appear in connection with the detailed description thereof and the novel features embodied in my inventive idea will be articularly pointed out in the claims.

11 the accompanying drawings,.

Figure l is a top plan view. Fig. 2 is a Fig. 3 is a viewin rear elevation. Fig. 4 is a sectional view of the. grinding shaft and boring bar. Fig. 5 is a sectionalview of the boring bar having a tool attached thereto. Fig. 6 is aview in section on theline 6-6 of Fig. 1. Fig. 7 is a view in section on the line 77 of Fig. 2. Fig. 8 is a view in section on the line 8-8 of Fig. 1. Fig. 9 is a View in section on the line 9-9 of Fig. 1.

Referring to the construction shown in the drawings, the character 10 designates the bed of the machine which is mounted on legs 12. A shaft 14 is mounted in bearings 13 and 15 secured to the bed 10 and is provided at one end with fast and loose pulleys l6 and 18 for receiving a driving belt. Secured to an intermediate portion of the shaft 14 is a spiral pinion 20 meshing with a spiral gear 22 which is rotatably held between standards 24 and 26 secured to the bed 10. This gear is splined to a tubular shaft 28 which for convenience will be termed a boring bar, although it may have attached thereto a tool for other purposes such as drilling. The boring bar 28 is mounted in bearings 30 and 32 attached to the bed 10 and is also rotatably mounted in the upper end of aplate 34 and prevented from slidmg therein by collars 36 and 38 secured to the boring bar at each side of the plate 34.

This plate extends upwardly from a carnage 40 mounted for reciprocation on slideways on the bed 10. The end of the shaft 14 opposite the pulleys 16 and 18 is pro-' vlded with a crown gear 42 which at diametrically opposite points meshes with pinions 44 and 46 secured respectively to clutch members 48 and 50 which are loose on a shaft 52 mounted at one end in a bearing 54 secured to the bed. The other end of the shaft 52 is provided with a screw-threaded portion 56 which works in a nut 58 supported by the carriage 40. The nut 58 is surrounded by a clamp 57 which may be tlghtened by a handle 59. When the clamp is loosened the nut is no longer effective to cause reciprocation of the carriage. Splined on the shaft 52 between the clutch members 48 and 50 and adapted to coiiperate with either of these members is a clutch member 60. Coiperating with the clutch member 60 is a forked shifting lever 62 pivoted to the bed at 64. A rod 66 is pivotally attached at 68 to the lever 62 and this rod after extending slidably through a bracket 70 attached to the carriage 40 is provided at its rear end with a stop 72. A stop 74 is secured to the intermediate portion of the rod 66. Secured to the shaft 14 adj acent the bearing 15 is a bevel gear 76 which meshes with a bevel pinion 78 secured to a clutch member 80 which is loose on a shaft 82 mounted in hearings on the bed. A clutch member 84 splined on the shaft 82 is adapted to cooperate with the clutch member 80 and may be moved into or out of clutching engagement by means of a lever 86. The rear end of the shaft 82 extends slidably through the plate 34 and is journaled in a bearing 88 secured to the carriage 40. A gear 90 is splined on the shaft 82 and this gear is held between the plate 34 and the bearing 88. The gear 90 meshes with an idler gear 92 rotatably mounted on the plate 34 and the gear 92 meshes with a pinion 94 which is secured to a rod 96 extending loosely through the boring bar 28 and supported at the ends thereof by ball bearings 98 and 100. The forward end of the boring bar 28 is screwthreaded at 102 for the attachment of different tools, Fig. 4 showing an attachment for grinding and Fig. 5 showing an attachment for boring. As shown in Fig. 4, a

sleeve 104 partly cut away at its central portion is attached to the threads 102. The forward end of this sleeve is provided with a bearing block 105 which is smaller than the surrounding portion of the sleeve and this bearing block is urged toward one side of the sleeve by a sprin 106. A pin 108 serves to hold and guide t e block 105 and a setscrew. 110 extending through the other side of the sleeve provides for positioning the block so that the hole therethrough may be placed eccentrically with relation to the axis of the rod 96. A short shaft 112 is rotatably mounted in the hole in the block 105 and a grinding wheel 114 is secured to the forward end of this shaft, the rear end of the shaft being attached to a member 116 of a universal joint having a member 118 attached to the end of the rod 96. Fig. 5 shows a sleeve 120 attached to the screw threads 102 of the boring bar and a boring tool 122 is secured in the outer end of the sleeve. A work support 124 is positioned below the grinding wheel or other tool and this work support is slidably adjustable transversely on a bracket member 126 which may be adjusted up and down by a hand wheel 128.

The operation and advantages of my invention will be readily understood from the foregoing description. The boring bar is driven at a reduced rate of speed from the shaft 14 on account of the .pinion 20 meshing with the large gear 22. By attaching a sleeve such as sleeve 120 shown 1n Fig. 5 to the borin bar the machine may be used for boring,

drllling, etc. The tool will be rotated at a slow rate of speed and through the action of the screw member 56 and shifting clutch member 60 will be reciprocated, the distance of travel in one direction before reversing being determined by the position of the stops 72 and 74. While the machine is being used for boring or drilling the clutch member 84 may be disengaged from'the clutch member 80. When it is desired to use the machine for grinding, the attachment shown in Fig. 5 is replaced by that shown in Fig. 4. Upon bringing the clutch member 84 into engage- .ment with the clutch member 80 the rod 96 and the grinding wheel 114 will be rotated at a high rate of speed on account of the difference in size between the gears 76 and 7 8, and also the gears 90, 92 and 94. When the boring block 105 is set eccentrically with relation to the axis of the rod 96 it is evident that since the boring bar is being driven at a slow rate of speed the shaft 112 will be moved bodily and any point therein will travel through a small circle. A slow planetary movement will thus be given to the rinding wheel, this movement being permitted by the universal joint which connects the rod 96 and the shaft 112. A longitudinal reciprocating movement is also imparted to the grinding wheel by means of the screw-threaded member 56, or, if desired, the reciprocating movement may be dispfnsed with upon loosening the clamp 57.

y the use of my machine engine cylinders or other cylindrical articles may be expeditiously and accurately ground or reground.

I claim:

1. A metal working machine comprising a support, a driving shaft mounted on said support, a boring bar, means operated from said driving shaft for longitudinally reciprocating said boring bar, means for rotating said boring bar from said driving shaft at a reduced rate of speed, a rod rotatably and non-slidably mounted in said boring bar, disconnectible means for rotating said rod in said boring bar from said driving shaft at an increased rate of speed, and means on the forward end of said boring bar whereby a tool may be attached for operation thereby or a grinding wheel may be supported for rotation by said rod.

2. A metal working machine comprising a support, a transverse driving shaft mounted on said support, a pinion secured to said driving shaft, a gear rotatably mounted upon said support in mesh with said pinion, a longitudinal boring rod upon which said gear is splined, means for reciprocating said boring bar from said driving shaft, a rod rotatably and non-slidably mounted in said boring bar, disconnectible means for rotating sald rod in said boring bar from said driving shaft atan increased rate of speed, and means on the forward end of said boring bar whereby a tool may be attached for opersupported for operation by said rod.

3. A metal-working machine comprising a bed, a longitudinallymovable carriage mounted on said bed, a driving shaft mounted on said bed, means operated from said driving shaft for reciprocating said carriage, a boring bar rotatably and non-slidably mounted at its rear end on said carriage, means for driving said boring bar from said driving shaft at a reduced rate of speed, a rod rotatably and non-slidably mounted in said boring bar, disconnectible means for rotating said rod from said driving shaft at an increased rate of speed, and means on the forward end of said boring bar whereby a tool may be attached for operation thereby or a grinding wheel may be supported for operation by said rod.

4. A metal working machine comprising a bed, a longitudinally-movable carriage mounted on said bed, a driving shaft mounton said bed, means operated from said driving shaft for reciprocating said carriage, a hollow shaft rotatably and non-slidably mounted at its rear end on said carriage, means for driving said hollow shaft from said driving shaft at a reduced rate of speed, a rod rotatably and non-slidably mounted in said hollow shaft, means for rotating said rod from said driving shaft at an increased rate of speed, a universal coupling attached to the forward end of said rod, a laterally adjustable bearing carried by the forward end of said hollow shaft, a short shaft rotatably mounted in said adjustable bearing, one end of said short shaft being connected to said universal coupling, and a grinding wheel secured to the other end of said short shaft.

5. A metal-working machine comprising a bed, a longitudinally-movable carriage mounted on said bed, a transverse driving shaft rotatably mounted on said bed, a longitudinal shaft having screw-threaded engagement with said carriage, means associated with said driving shaft and withsaid longitudinal shaft for reversing the direction of rotation of said longitudinal shaft at the two extreme positions of said carriage, a hollow shaft rotatably and nonslidably mounted at one end in said carriage, means for driving said hollow shaft from said transverse shaft at a reduced rate of speed, a second longitudinal shaft, means for rotating said second shaft from said driving shaft at an increased rate of speed, a rod mounted in said hollow shaft, means for rotating said rod from said second longitudinal shaft at an increased rate of speed, a universal coupling attached to the forward end of said rod, a laterally adjustable bearing carried by the forward end of said hollow shaft, a short shaft rotatably mounted in said bearing, one end of said short shaft being connected to said universal coupling, and a grinding wheel secured to the other end of said short shaft.

6. A metal-working machine comprising a bed, a longitudinally-movable carriage mounted on said bed, a transverse driving shaft rotatably mounted on said bed, a gear secured to said driving shaft, pinions meshing with said gear at diametrically opposite points thereof, clutch members to which said plnions are secured, a longitudinal shaft upon which said clutch members are loosely mounted, a clutch member splined to said last-mentioned shaft between said loose clutch members, said shaft having screwthreaded engagement with said carriage, means for shifting said splined clutch member at two extreme positions of said carriage whereby the direction of movement of the latter is reversed, a hollow shaft rotatably and non-slidably mounted at one end on said carriage, a pinion secured to said transverse shaft; a gear in mesh with said pinion and splined on said hollow shaft whereby the latter is rotated, a second longitudinal shaft, means for rotating said shaft from said driving shaft at an increased rate of speed, a rod extending rotatably through said hollow shaft, means for rotating said rod from said second longitudinal shaft at an increased rate of speed, a universal coupling attached to the forward end of said rod, a laterally adjustable bearing carried by the forward end of said hollow shaft, a short shaft rotatably mounted in said adjustable bearing, one end of said short shaft being connected to said universal coupling, and a grinding wheel secured to the other end of said short shaft.

7. A metal-working machine comprising a bed, a longitudinally-movablev carriage mounted 011 said bed, a transverse driving shaft rotatably mounted on said bed, a crown gear secured to said driving shaft, pinions meshing with said crown gear at diametrically opposite points thereof, clutch members to which said pinions are secured, a longitudinal shaft upon which said clutch members are loosely mounted, a clutch. member splined to said shaft between said loose clutch members, said longitudinal shaft having screw-threaded engagement with said carriage, a shifting device attached to said splined clutch member, said shifting device being operable at the two extreme positions of said carriage whereby the direction of movement of the latter is reversed, a hollow shaft rotatably and non-slidably mounted at one end on said carriage, a pinion secured to said transverse shaft, a gear in mesh with said pinion and splined on said hollow shaft whereby the latter is rotated, a bevel gear secured to said transverse shaft, a bevel pinion in mesh with said bevel gear, a second longitudinal shaft upon which said bevel pinion is loosely mounted, a clutch for connecting said bevel pinion with said longitudinal shaft, a gear rotatably mounted on said carriage and splined on said last-mentioned shaft, an idler gear rotatably mounted on said carriage and meshing with said last-mentioned gear, a pinion in mesh with said idler gear, a rod to one end of which said pinion is secured, said rod extending rotatably through said hollow shaft, a uni-v versal coupling attached to the other end of said rod. a support attached to the contiguous end of said hollow shaft, a laterallyadjustable bearing carried by said support, a short shaft rotatably mounted in said adjustable bearing, one end of said short s aft being connected to said universal coupdng. and a grinding wheel secured to the other end of said short shaft.

In testimony whereof l hereunto a div my signature.

ORAN S. ITAMMAGREN. 

